. >> reporter: as the day goes on we learn that 29-year-old medford, massachusetts resident krystle campbell is one of the other victims of the attacks. her mother patty tried to hold back emotion for the cameras. >> she had a heart of gold and all smiles and couldn't ask for a better daughter. >> reporter: third victim is revealed by boston university, to be a 23-year-old graduate student, chinese national lingzi lu. her adviser and professor remembers a kind woman with a bright future. >> such a waste of all the time and energy and dreams that she had, and we'll never know what she could have done. >> reporter: day three, still no arrests and a city on edge. governor deval patrick spoke with cnn's wolf blitzer urging the public to be patient. >> this is going to take some time, a lot of time, and particularly given that there hasn't been an individual or group that's claimed responsibility. >> reporter: day four, president obama comes to boston and speaks of an interfaith service telling boston the country stands with it. >> the world will return to this great american city to run harder t